Define the job before choosing an indicator
A system needs explicit entry, sizing, and exit rules; it does not necessarily need separate indicators for each job. An opposite moving-average cross can be a valid exit rule to test. Adding more indicators increases complexity and can fit historical noise without improving future results.
| System component | Decision to specify | Candidate inputs | Important limit |
|---|---|---|---|
| Trend filter | Which direction or regime permits a trade? | Price relative to an EMA; ADX for strength | ADX alone does not identify bullish or bearish direction |
| Entry trigger | What event starts a position, and when is it known? | Confirmed momentum cross or a break of a prior channel | A signal price is not necessarily the available fill price |
| Initial stop | What price invalidates the trade? | Confirmed swing level or an ATR distance from entry | A stop is not a guaranteed fill at that price, especially across gaps |
| Exit update | When does an existing exit change? | Opposite cross, ratcheted ATR trail, or a fixed target | Define priority if more than one exit is touched within a bar |